Hello everybody,
i am happy to announce that Car4Car j2me client now also support OSM Mapnik tiles. this is a lot faster and looks better than the old Osmarender6 maps which didn't even worked the last weeks. Go try it out. Anyway this was a quick release to get maps working again. There will be another one when I finished tiles caching and some graphic speedups.
I will finish my master thesis about C4C Traffic Information System in a month now. I will need some time to evaluate my work now.
regards,
Michael Willigens
update:
j2me version 1.5.2 now supports tile caching and faster graphic operations
hello,
after some time of writing my thesis i am now working on some big improvements on mobile java mapping client. i hope it can be released in a couple of days.
f.y.i.: i know that mobile map client shows empty maps at the moment. its because of rewriting a lot of server code and filtering the osm maps to our needs
regards,
michael
Hello,
i have recently implemented tile fetching and caching. The car4car server now looks up the map-tiles from OSM mapnik layer. It caches them afterwards to reduce OSM network load.
The big deal about it that it is now much faster even on lowest zooms.
cheers,
Michael W
I am happy to announce that the first attempt to detect and visualize traffic congestions is now working. Check the projects website. It mainly looks similar like www.autobahn.nrw.de where red segments indicate congestions and green ones a good condition. My focus is now on optimizing algorithms and parameters and of course writing my thesis.
greetings,
Michael Willigens
I am happy to announce that the first attempt to detect and visualize traffic congestions is now working. Check the projects website. It mainly looks similar like www.autobahn.nrw.de where red segments indicate congestions and green ones a good condition. My focus is now on optimizing algorithms and parameters and of course writing my thesis.
greetings,
Michael Willigens
I am happy to announce that we have got our S60 C++ CellID helper tool signed. It is uploaded to the car4car project. I will put this also on the
car4car.psi.de website.
You dont have to selfsign this application for you IMEI anymore. It is ExpressSigned through SymbianSigned now.
The release of the UIQ version will take some days. Anyway we finally got this one working.
We released a Symbian C++ helper tool.
It is useful to enable some A-GPS and GPSless features if the J2ME isn't able to read network information.
However, one must self sign this software using the "ReadDeviceData" capability on <a href="http://www.smybiansigned.com">http://www.smybiansigned.com</a>. This is because Symbian is giving us a hard time with our certificate. We hope this will be ready soon without self signing.
Anyway, this additional tool is optional and only needed if one wants to read network infos on mobiles where our J2ME code just doesn't have the proper permission to do this. If you have a mobile with GPS or a Bluetooth GPS than this is just for entertainment or educational use.
Known mobiles working with J2ME app only:
- Sony-Ericsson's up to K770i
- some Motorola mobiles
- possible some S60 second edition Nokia (not tested)
Known mobiles working with this helper tool:
- All S60 3rd edition for now.
UIQ version coming soon.
Car4Car mobile client now supports more end devices by using A-GPS and GPSless technologies.
It also has a complete new UI using the J4ME library http://code.google.com/p/j4me (apache license)
A MCC/MNC/CELL/LAC http service has been added so that GPS user supply informations about new cells as well as position corrections from known cells.
GPSless users can sue this information to get their position.
The mapping material and the CellId database only contains the region around Duesseldorf/NRW/Germany. The J2ME client will still work when used elsewhere displaying a "debug" location around Duesseldorf. If GPS coordinates are available, the client cant render a map outside of Duesseldorf (he can but it will be empty due to the lac of mapping material).
There will be Symbian C++ helper tool to supply Cell information on various phones where the generic Java way doesnt work. Its kind of a http://midpjni.com JNI bridge to call Symbian functions. I am working on this at the moment. However once ready the J2ME client will ask this daemon if installed properly.
So far the Java style works on lots of phones. Good exerience has been made with last generation SonyErricsson mobiles (k770i for example).
The JNI bridge will add support about Cell nformation on any Symbian 9.X phones (i.e. Nokia S60 phones, N95 ++ etc)
Any questuions/suggestions to mwilligens@psi.de
regards,
Michael Willigens
We have finished a realtime player of SUMO network dump files.
It is now possible to play a sumo simulation in realtime.
Randomly chosen cars of the SUMO simulation are beeing
launched as J2MEs clients networking threads.
Because seeing is believing check:
http://car4car.psi.deThe server is now playing a 20minutes simulation in a 24h loop.
Displaying random chosen 2% of 3000cars simulated in the area of
Duesseldorf/NRW Germany.
- Dramatic Client speedup
- SUMO network export works now
column indicates how many devices have been reported as compatible. Conversely the 
column indicates how many devices have been reported as incompatible. 
